Advanced Nebulizer Systems and Clinical Medication Delivery

Small Volume Nebulizers (SVN) and Corrugated Tubing

• Medication Delivery Consistency: When using corrugated tubing with a small volume nebulizer, a constant smoke cloud is produced. This indicates that medication is being continuously released into the environment. The amount of medication the patient receives is significantly affected by the delivery method used.
• Mouthpiece vs. Face Mask:     * Preference: Using a mouthpiece (putting the device directly in the mouth) is generally preferred over a face mask for better deposition.     * Deposition Benefits: Placing the device in the mouth ensures the medication goes straight into the airway rather than dissipating around the face.     * Hygiene and Comfort: Face masks often cause the patient’s face to become wet and moist due to the continuous output of aerosol from the corrugated tubing. Patients frequently request napkins to dry themselves during or after the treatment.
• Indications for Face Mask Use:     * Pediatrics: Children who cannot effectively hold the mouthpiece.     * Geriatrics: Elderly patients who lack the coordination or strength to hold the device.     * Physical Limitations: Patients who lack arms or the physical capacity to hold the nebulizer.     * Anecdote: A specific patient without arms was documented as being able to hold the mouthpiece in his mouth "like a champ" for the full $10\,\text{minute}$ duration of the treatment without assistance.
• Patient Breathing Techniques:     * Deep Periodical Breaths: Patients should be instructed to take deep, periodic breaths during a small volume nebulizer treatment.     * Technique: Breathe in, hold the breath for a few seconds ($5\,\text{to}\,10\,\text{seconds}$ if possible), and then breathe out.     * Recovery: Follow deep breaths with normal breathing. Patients should not take deep breaths back-to-back as this can cause them to pass out (syncopal episodes).
• Assembly and Maintenance of SVNs:     * Disadvantages: Minor disadvantages include the requirement for assembly (putting three parts together).     * Wear and Tear: Reusing nebulizers in a hospital setting can lead to the threads becoming "disgustingly cruddy," which prevents the device from threading properly. In these cases, the nebulizer should be discarded.     * Treatment Time: While some lists cite treatment time as a disadvantage, the speaker notes that standard SVN treatments are not generally longer than necessary unless the device is being misused or compared incorrectly to an LVN (Large Volume Nebulizer).

Breath-Enhanced and Breath-Actuated Nebulizers (BAN)

• Breath-Enhanced Jet Nebulizers: These devices feature an inspiratory valve that forces the medication toward the patient during inhalation, maximizing delivery efficiency.
• Breath-Actuated Nebulizers (BAN):     * Operation: These devices, sometimes referred to as "son of a gun" nebulizers, feature a control on top with two settings: a solid arrow and a series of dots.     * Breath-Actuated Setting: The medication is only released when the patient breathes in. This is ideal for talkative patients who take the nebulizer out of their mouth to converse, as it prevents medication waste.     * Continuous Setting: The device works like a standard SVN where aerosol is produced constantly.     * Clinical Use: Particularly useful for "hallway treatments" where minimizing environmental medication particles is necessary.
• Integration with Other Devices:     * Aerobica: A breath-actuated nebulizer can be attached to an Aerobica device. The Aerobica is used for Chest Physical Therapy (CPT) and contains an actuator that helps "shape the bronchioles" and induce a cough through vibration and resistance.

Mesh Nebulizers and Home Care Hygiene

• Mechanism: Mesh nebulizers function by moving medication through a physical mesh to create an aerosol. They do not require a compressed gas source.
• Consumer Accessibility: Many mesh nebulizers are available on platforms like Amazon for approximately $\$40$. Many are rechargeable via universal USB connections.
• Hygiene Warnings:     * Contamination: Patients often keep medication stagnant in these devices or carry them in purses without protection for the face piece, leading to the accumulation of germs and particles.     * Clinical Risk: Poor hygiene with mesh nebulizers can lead to severe infections, as the contaminated aerosol goes directly into the lungs.

Advanced ICU Applications: The Aerogen System

• The Aerogen Nebulizer: Described as a "set it and forget it" device. It is highly valued in the ICU for its efficiency and ease of use.
• ICU Integration:     * In-Line Use: Aerogen can be placed in-line with a ventilator. This allows bronchodilators, steroids, and other medications to be nebulized directly down the Endotracheal (ET) tube.     * Power Source: It uses a USB-style controller and can be powered by electricity. While it can connect to a gas hose, it can operate solely on power when used in certain vent configurations.     * High-Flow Therapy: It can also be integrated with high-flow devices like Vapotherm via a special port, allowing medication to be delivered through the nasal cannula.
• Epoprostenol (EPO) Administration:     * Role: EPO is a vasodilator used for severe oxygenation problems, often in cardiac units.     * Logistics: It has a very short shelf life and half-life. It is extremely light-sensitive and arrives in long syringes inside protective bags.     * Financial Impact: EPO is ungodly expensive, estimated at approximately $\$32,000$ per treatment.     * Monitoring Requirements: RTs must check the line, the vent, and the circuit every hour to ensure there are no clogs. If the medication runs out or the line dries, the patient loses all progress immediately.     * Continuous Mode: For EPO, the Aerogen is set to a "continuous" mode rather than the standard $30\,\text{minute}$ timer.
• Safety and Pregnancy Precautions: Due to the aerosolization of particles, healthcare workers who are pregnant or suspect they might be pregnant are strictly prohibited from entering a room where EPO is being nebulized because it can affect the fetus.

Clinical Troubleshooting and Oxygenation Protocols

• Order of Operations: When a patient cannot oxygenate, doctors typically follow a specific sequence before resorting to expensive treatments like EPO:     1. Diagnosis: Identifying blockages via bronchoscopy.     2. Ventilation Optimization: Utilizing ARDS (Acute Respiratory Distress Syndrome) protocols.     3. Pressure Adjustments: Balancing High $FiO_2$ (Fraction of Inspired Oxygen) against High PEEP (Positive End-Expiratory Pressure) to pump open the alveoli.     4. DuoNeps: Doctors may order $q2$ (every two hours) DuoNeps even if a bronchospasm isn't present, simply to exhaust all therapeutic options.
• Transport: Transporting a patient on continuous EPO/Aerogen therapy is described as a significant difficulty and a "pain in the ass" for the clinical team.

Pressurized Metered Dose Inhalers (pMDI)

• Patient Population: Frequently prescribed for patients with COPD (Chronic Obstructive Pulmonary Disease) and other pulmonary diseases who struggle to take the deep breaths required for other devices.
• Functionality: pMDIs use a propellant to help drive the medication deeper into the lungs (improving deposition).
• Components of a pMDI:     1. Canister: Holds the medication and propellant.     2. Propellant Mixture: The substance that provides the force for the spray.     3. Drug Formulary: The specific medicinal concentration.     4. Metering Valve: Controls the exact dose released per puff.     5. Dose Counter: A visual indicator showing how many puffs remain. The speaker notes these are difficult to reset, which prevents simple canister replacement without a new counter.

Questions & Discussion

• Instructional Tools: The class discussed using a "Farm Kahoot" (Pharmacology) review session in preparation for the upcoming test.
• Technical Issues: There was a discussion regarding difficulties navigating the slideshow, with a recommendation to "zoom out and use the arrows" to fix issues where slides appeared out of numerical order (e.g., jumping to slide 10 unexpectedly).
• Electrical Standards: A brief debate occurred regarding whether equipment in the United States uses AC or DC power. While a student suggested DC, the speaker expressed uncertainty and suggested someone check the standard (which is AC for wall outlets).